:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--dark-text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--box-shadow);
    border-radius: var(--border-radius);
    margin-bottom: 30px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    text-align: center;
    color: white;
    padding: 60px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    margin-bottom: 50px;
    backdrop-filter: blur(10px);
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 10px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-control, .btn-danger {
    padding: 12px 30px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
}

.btn-control {
    background: #4CAF50;
    color: white;
    padding: 10px 20px;
    margin: 5px;
}

.btn-control:hover {
    background: #45a049;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

/* Sections */
.section {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    margin-bottom: 30px;
    box-shadow: var(--box-shadow);
}

.section h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

/* Video Container */
.video-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

video {
    width: 100%;
    border-radius: var(--border-radius);
    background: #000;
}

.video-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

/* Meeting Controls */
.meeting-controls, .stream-controls, .transcript-controls, .translation-controls {
    display: flex;
    gap: 10px;
    margin: 20px 0;
}

input, select {
    padding: 10px 15px;
    border: 2px solid var(--light-bg);
    border-radius: var(--border-radius);
    font-size: 14px;
    flex: 1;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Info Displays */
#meetingInfo, #streamInfo, #transcriptDisplay, #translationResult {
    background: var(--light-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-top: 20px;
    min-height: 100px;
    overflow-y: auto;
}

/* Stream Chat */
.stream-chat {
    border: 2px solid var(--light-bg);
    border-radius: var(--border-radius);
    margin-top: 20px;
}

#chatMessages {
    height: 300px;
    overflow-y: auto;
    padding: 15px;
    background: var(--light-bg);
}

.chat-message {
    margin: 10px 0;
    padding: 10px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.chat-input {
    display: flex;
    gap: 10px;
    padding: 15px;
    border-top: 2px solid var(--light-bg);
}

.chat-input input {
    flex: 1;
}

.chat-input button {
    padding: 10px 20px;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.feature-card {
    background: var(--light-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
}

.feature-card .icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

/* Footer */
footer {
    background: rgba(255, 255, 255, 0.95);
    text-align: center;
    padding: 20px;
    border-radius: var(--border-radius);
    margin-top: 50px;
    color: var(--secondary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .video-container {
        grid-template-columns: 1fr;
    }

    .meeting-controls, .stream-controls, .transcript-controls, .translation-controls {
        flex-direction: column;
    }

    .hero h1 {
        font-size: 36px;
    }

    .nav-links {
        gap: 15px;
    }
}